More Pokemon are coming to Pokemon GO. And so are corporate sponsors.

If you're still playing Pokémon GO (and a lot of people still are!), a treat may be coming your way on December 12: More Pokémon are coming to the game, according to a tweet from the game maker.

The immediate question: Is this the next generation of Pokémon, originally from "Pokémon Gold" and "Pokémon Silver"? Or is this the unveiling of the legendary Pokémon like Zapdos and Mewtwo? Both have been found buried in the game's code, according to EuroGamer. There are a handful of legendary Pokémon, but adding Generation II would mean 100 new critters.

We have a few new experiences and in-game events planned for you before wrapping up the year. While we cannot share all the details yet...

John Hanke, Niantic

On the same day, game developer Niantic announced a partnership with Sprint. The network is turning Sprint, Boost Mobile and Sprint at Radioshack locations into PokéStops and Gyms, making more in-game landmarks for players to explore. That release also hinted (vaguely) at the earlier announcement.